well it depends on how good your art is and how much of a fanbase you can generate. You should mix and match things up and say have a level of drawing you can do for free like something that gives you practice yet isn't a time huge time sink like maybe a rough sketch of an OC's face and then charge more if they want you to go beyond that for full body, coloured, show accurate, etc.

The freebies will get folks looking at your stuff and those that can afford the extra details might request them. 

Also for prices, check out what other artists charge for art of the same level as yours... and then be a douche and undercut them my offering the same service for £1 less XD

well it depends on how good your art is and how much of a fanbase you can generate. You should mix and match things up and say have a level of drawing you can do for free like something that gives you practice yet isn't a time huge time sink like maybe a rough sketch of an OC's face and then charge more if they want you to go beyond that for full body, coloured, show accurate, etc.

 

The freebies will get folks looking at your stuff and those that can afford the extra details might request them. 

 

Also for prices, check out what other artists charge for art of the same level as yours... and then be a douche and undercut them my offering the same service for £1 less XD

Thanks for your advice. I'm going to try and make an Etsy listing for commission vectors. Hopefully it goes well!